I think you're being extremely harsh on John & Guy in light of the various problems they have endured with the SP-2. If riders of their experience and talent fell fowl to inherent technical gremlins with the bike, I can't think that any potential replacements would have fared any better. It could well be that both JM & GM decide to call it a day after being spat off unceremoniously, but I've no doubt they would like to have been given a proper opportunity to show what they could do at the TT. I can only hope that whoever rides the new 'Blade in future can do so without suffering similar unforced & near-catastrophic mechanical/electrical issues.