It is being fast-tracked through a Special Session, however there is discussion that a Special District created during a General Session of the Legislature cannot be dissolved during a special session and would require the full procedure offered by a General Session (I'd have to see more evidence of that though). Add to that the simple fact that Disney is the majority landowner within the district and there's no chance they will be voting, as described in 189.073(1)(a) to dissolve. Finally, there is absolutely zero chance that the law will not simply be appealed by Disney and that would likely result in a stay for some period of time.
Any dissolution would not occur until June of 2023 per the text of the law, so at the very least, in the absence of any adverse interpretation of the powers of the Legislature, and any pending challenges to the law, your would not see anything happening until next year.
It wasn't negotiated because DeSantis slipped it onto a special session that was convened with the sole noticed purpose of addressing redistricting. The agenda was changed at the 11th hour and the RCID dissolution bill slipped in. There is already some questions as to how Randy Fine just happened to show up with a bill already written in his back pocket.
I'll stick with my original estimate that it will be several years of legal back and forthing before anything comes out the other end, even if DeSantis has the entire House over for a BBQ tomorrow and signs the thing over dessert.