again, i said, so you want what classic is dealing with now, most guilds complete the raid in 1 week and then have 0 content to do till the next patch.
you want to go back to TBC days, as even back in wotlk we got multiple raids, starting with 2, quickly changing to 4 with release of ulduar.
you want to go back to TBC raiding instead of wotlk to now? i say thats wrong, more options is far better.