Every time I hear another "let's throw out X!" campaign, I become suspicious. It's not as if X is flawless, far from it, but its detractors seem to harp on petty and irrelevant nonsense more than actual flaws--nonsense like "Remote X is hurting desktop effects."
A new system designed to do what X does (the good parts) in a way which is incompatible with X and builds on what we've learned from X in the last 20 years, especially about what not to do, would be welcome. If the new system is just replicating a small piece of what X does and ignoring the rest then it isn't a replacement for X.
Is it time for X12 or a Z? Probably. But, please, let's not step backwards while we're at it.