I have five or six Makita 18v batteries and a load of their tools. If they only make new tools with the new battery they are potentially making me quite miffed. If I want the new tool I need also the new batteries and charger. Also I'd need multiple batteries because you can't really only have one.

Personally I'd be happy for that situation because of the big upside, but I can see why a company would not want it.

Plus, the most logical thing to do is not make a new standard, but pick an existing one. But who gets to be the golden brand whose battery system remains unchanged?

I would love it to happen but I can't see it happening for a while.