The only alternative is to keep regressing him again like they did in BW. Honestly it was the backlash toward BW that probably made the writers make Ash competent and mature again with XY.
BW was meant to be a reboot but keeping the same main character made no sense. Had Ash have left the anime at the end of DP, and BW was a new guy traveling with Iris/Cilan...it would have made more sense.
I hope the writers knows that people don't want to watch another BW Ash again