TR solves nothing, you’d need to be 2100 rating to just get the same TR as a +10.
People stuck in 1600s due to gear will slowly save up for 430 rolls, which honestly have worse returns than the conquest system where you can get choosen 415 in each slot by week 7, and work towards guaranteed(or get random) 430 upgrade tokens. M+10 would remain as mandatory as ever.
At the end of the day the PvP gearing right now is M+ with a very nice backup gear weekly. Problem isn’t that PvP is underperforming, but that M+ is way too easy for the reward it offers. PvP stacks up to raiding far more favourably as far as rewards go, both locking better rewards beyond higher difficulties and feeling forced to m+ for superior rewards.
M+ in the end needs to enforce timed runs, and a higher key limit for best rewards as +10 is just silly for repeatable Heroic loot and weekly nearly Mythic stuff. In just a few weeks the 2nd minor slot will be common place, making +10s even more of a joke than they already are.