The Republican Party would be a hallowed out mess and would be battling back for votes they lost in the next cycle. Americans needed to experience voting for a viable third party in order to be broken under the two party spell and this exactly does that. While Perot’s time is likely over, he hands the reins over to a successor (Buchanan or Trump) and perhaps the GOP is in such a precarious position they eventually form an alliance with the Reformist to ensure their survival as a national party. A Trump-Bush ticket upsets Gore in 2000, Trump spends his presidency warring against Neocons, Paleocons and even his own party.

What do you guys think would actually happen in the long run if he did this

Too bad even if you have electoral supermajority and Perot scores double digits before endorsement, it's impossible for him to win and many deeply red states turn deep blue.

After Bob dole falls off the stage his advisors ask what should he do as he lay in the hospital bed

Bob Dole drops out and endorses Ross Perot