Basically, LMA is going to be past his prime by the time they retool the roster. He's at his PEAK so unless the plan is for him to be a bridge b/w the old regime & the future, each season that passes by his a year of his prime.
Besides Jrue Holiday, there aren't any two-way point PGs in Conley's tier that will be available within the next two summers. As of right now, the Spurs have the WORST point guard depth among ANY of the 16 playoff teams not named Houston.

(I don't mind PATFO maxing out Conley, if it means Porker gets traded)
The reality is that Porker isn't getting traded thus there won't be any PG upgrade until 2017 when PATFO could let Patty walk & bring back George Hill. We'll know what they plan to do w/ the frontcourt come June 30th, which is Diaw's judgement day. If Tim/Manu plan on coming back then Diaw would most likely not get waived & PATFO would only have the MLE to throw at a free-agent backup center.