Re: Eldritch Blast changes, that'd be a pretty big nerf to Warlock DPR (1x stat bonus instead of up to 4x stat bonus, and 1x hex die instead of up to 4x hex die), and nerf to how fun they are to play for sure too (rolling multiple attacks even if some miss feels vastly more rewarding than rolling one big attack that sometimes hits big and sometimes misses totally - it's also better for avoiding overdamage), so I definitely don't think that's likely, especially as it would introduce a pretty serious incompatibility with the PHB Warlock.
I think it's more likely we'll see Invocations expanded out though, and I think as people are more math-savvy now and less knee-jerk-y, you could even do stuff like make Agonizing Blast apply per-die (assuming no Cantrips roll multiple dice at L1, but I don't think they do?), which would make the DPR on stuff like Fire Bolt a lot closer. Back in 2014 people would have been panicking and rioting if you suggested that (even though arguably EB would STILL be better!) but now I don't think you'd have that reaction.