Both Cliff High and McAfee have made bold claims about Bitcoin's future. McAfee recently claimed that Bitcoin would reach a million by 2020. Do you take these predictions seriously?
They're just predictions so you can't really put any weight behind them. This is true for all predictions.
As for these in particular I don't really give McAfee too much credit for his $1m claim. He doesn't seem to support it with anything. If someone of his renown came out and explained why BTC would or even could reach $1m then I think people would listen more compared to "it's going to 1m or I'll eat my dick on TV"