I think that without the details it is hard to predict it, so we need to wait until next month.
However, one thing that is basically confirmed is that you would still be able to play seasons, so you will receive new content from time to time. So in this sense I believe the game accessibility will be far less restrictive than others.
We need to better understand if they are going to artificially nerf items by bumping expansion ones and introducing exclusive content to something like WT5 only available in expansion, for example (I hope not though).