Well I guess time will tell, I would expect them in that case to have two versions, online and desktop Pro. If the web version is up to scratch then it would be a good addition and handy when on the go. I still think they are going to put ad’s into the web version as a revenue generator, because they know their audience exactly (mostly free users) so it could make them a ton of money.
Online is not going to be powerful enough to support very complex scenes but it has it’s uses. I don’t see them abandoning native desktop for quite some time (4-5 years at least until global infrastructure has caught up).
As an illustrator my models are very large and complicated but my needs are a lot less than somebody using it for Architecture work. My main concern is the computing power, plugin support and rendering support. If they can get all of those locked down and it works then I would use it in conjunction with desktop. I am lucky living in a well connected country with almost 1Gbps when cabled and >300/100<Mbps on my wifi.
If they do gut the functions of Pro, then everybody will simply use other software, it’s not like there isn’t a bunch of other options around they are just more complicated to use from the outset but over time much more powerful.
I am going to give them the benefit of the doubt and see what it looks like in 12-24 months.
Edit: I used to live on a boat in London, I would have been very mad then as it was pants about 1Kbps