There might be other arguments to make the point you want to but mass developer adoption is not one of them. Circa 1998 your line could have been - "Go to a tech conference. Count PCs to Macbooks and tell me again why the army of devs that choose Microsoft today will suddenly write apps for a soon to be dead <insert technology here>?". Developers largely follow users - so I look at apples enthusiastic userbase as a much more effective moat than Apple's popularity with developers.