I don't think any taxonomic lists (current or historic) have been targeted towards a birders as a key demographic - unless you count the EBird derivative from Clements, but despite this we have managed. The same people are behind AviList as behind the major taxonomic lists, so the chance that this will end up being something that is a complete mess for birders seems to me very remote.
And if AviList is published in an unfriendly format, I am sure we will find a workaround. I am a bit of a duffer at computing, but when 'HBW Alive' was about to close down, I still managed to write a webscraper and extract all the subspecies, subspecies groups and range information, before it was lost - this was before BirdLife's official list included subspecies (and it still doesn't include range data). So I am sure that the developers of Scythbill etc. will be able to easily extract the 'goodness' from any unfriendly format that AviList may take.
I have not heard this rumor, but I think this would be a huge mistake, and I would have thought that all parties would have learnt the lesson of Howard and Moore trying to monetarist their intellectual property... a decline into obscurity.
I think we forget, what it used to be like. My first year list is for 1983 - no internet, no electronic lists - in fact computers were a novelty. If you wanted a global taxomomy you basically had to folk out on a hard copy volume and work from that. Dutch Birding used to produce a little checklist for the Western Palearctic (which I loved), with check boxes to physically tick off what you had seen!
...IOC is now version 15.1, so presumably is a mere youth at 15 years old. Clements 6th Edition was the last hard copy edition, published in 2007 (a mere 18 years ago).
So I think we can say that we have been rather spoiled over recent years, by the advent of electronic lists and by three world taxonomies available as user friendly free excel downloads. Perhaps like many other things in life, once we have choice we resent not having it, but to console ourselves, perhaps we just reflect that things will still be a lot better than a mere 20 years ago.... and again like many other things, perhaps less choice is necessarily not a bad thing?
We bird watched and listed in the past, in a world of limited (and expensive) choices, and I am sure we will continue to list and bird watch if we end up with one unifying taxonomy.... but who knows, perhaps even Howard & Moore may be updated as an alternative for those wanting to take a different route (although they may well have to splash the cash).
For me, the biggest train crash for birders is the rapid withdrawal of a used taxonomy or a system. My friends (probably on about 6,000 at the time), were using HBW Alive to record their sightings. They were promised a soft transition when the system was sold to Cornell and thus had to change from BirdLife's to Clement's taxonomy. The way they describe it, it was nothing of the kind, and they spent many hours over several months, checking and re-inputing their data. At least the change to AviList is being done slowly (by IOC, Clements and BirdLife) and so far without crashing whatever systems we like to use. Just imagine you were one of the unlucky ones who way back in the day picked Sibley & Monroe as the way to go! I feel I was a bit unlucky, as my first world taxonomy was this
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...long since consigned to the bin, and now selling on the internet from the princely sum of £5.57. Not even worth keeping as a collectors item!