With the first main expansion of the Witcher 3 the DLC requires a character to be at level 30 in order to play. If your character is nowhere near that level you can opt to start with a default level 30 character and continue on from there. A similar approach could work in Borderlands going forward.
Borderlands is a long game and for someone who has invested a lot of time into a high level character might not be so enticed to do it all again. The first play through is fun the first character but can feel like a bit of a slog for additional characters. Borrowing on the idea from the Witcher 3 maybe once a playthough has completed a mode could be unlocked to allow subsequent characters to be started with at a default 34-ish level in TVHM mode and skipping over the first play through. For me this idea would mean I would be more likely to try out other characters and probably spend a lot more time playing it.