How does a feature that is probably a year away makes this a decent deal? No one is buying blooms now with the intention of sitting on them until rarity growth.
Rarity growth notwithstanding, no, this isn't a decent deal at all. 6* skill blooms are typically 500-1000NG when they come up on a daily deal (usually paired with a 6* unit) which makes the dressbloom "worth" 2000-2500 NG in this offer? No.