Will anything replace it? There needs to either be an improved basic tier, or mid-level tier I think. Not sure how this was "less popular that we thought". I think the Evernote bean counters and the users may have differing opinions on popularity of it, vs, driving people to buy the expensive over-blown Premium tier that a lot of people don't need.
Just remember, you're now competing with Office 365's FREE solution. Most offices have MS Office, granting them access to a shared notes system.