I think that would be an extremely minority opinion far outside of the moderate dem mainstream. Since the electors get specifically chosen by the winning campaign, expecting some kind of broad revolt out of them is very wishful thinking.

Additionally, Biden was polling very close to Trump during a time when dems have been outperforming polls in our recent elections. Someone would have to be fairly ignorant of the actual voting results of recent races to actually think Biden genuinely had no chance. I do not think very many chosen delegates are ignorant of these election results, unlike more casually-engaged citizens online.