I actually wouldn't see a problem with the limitations if the level cap was 70 now, because even if you couldn't do ShB solo stuff, there are still a lot of valuable things to do at level 70 and 60, so I'd love if BLU could:
- First of all, for this to work, BLU really needed to be overpowered as it was advertised, to be able to actually solo stuff;
- Getting into Diadem and Eureka
- Getting into PotD and HoH solo
- Being able to complete map runs solo (level 70 mats and crafted items are even more expensive than level 80 atm)
- Masked Carnivale having a pvp mode

The real problem right now is that BLU "endgame" is really stale and unrewarding. If you experienced Masked Carnivale once, and you don't need Seals, there's little incentive to do its "puzzle fights" again and again.