Seems like txt was a replacement for bts, but hasn't really had the same success. So, next.
Well txt are only 4 years into their career so I think it would be a bit ridiculous for bighit to expect them to have the same amount of success as bts right now.... and it also took bts many years to reach the level of fame they're at right now.
Edit:
A face reader from the youtube channel DKDKTV did say the years 2021, 2022, 2023 will be the years where txt "sow their seeds" for success (aka rituals/ initiation, and he hints at it by doing devil horns and the 666) and around 2025, 2026, 2027+ will be the years where they will reach "international success"... so if his prediction is correct, when they renew their contract around 2025, it will take them around 7 years to reach international success and peak in their career, which was the same thing that happened to bts...