Reissues of past LTBs would be a poor decision on Gree's part.
New players do/will not need them for two reasons. First, new players probably can't afford even the cheap LTBs, and secondly because inflation means most of the LTBs down the road will be better than a lot of the buildings we've already seen.
Being able to afford an LTB during the limited time it is offered is part of the challenge. If Gree were ever to announce plans to reissue old LTBs it would effectively break the LTB facet of the game. Can't afford or don't like a building currently offered? No sweat, just go back and build something else you couldn't afford at the time. This also means anyone who is able to afford an LTB during the limited time has accomplished nothing, since the term "limited time" no longer applies.