Well my “proposal” certainly didn’t carry the weight of Harrison’s and Fladmark’s. My point was that even a dumb layman like me could figure it out long before entrenched academics would even consider the possibility. Enormous effort was required to lure textbook-selling Luddites to Chile to even consider the evidence of pre-Clovis habitation at Monte Verde.
You are certainly right that the Clovis-first crowd has retarded research for a couple of generations, and is still trying to do so. But the tide has turned.
I have evidence of that early coastal migration from some of my own work, with an early dated occurrence of haplotype A01. DNA research is sure giving us a lot of new tools!