Go forth! Even if he was able to go with you, you can't be sure he wouldn't crap out after a few days or weeks. Being flexible is pretty darned necessary when you tour. I have completed 6 short (1-3 week) tours all solo and have met some pretty interesting people along the way. Being alone makes you open to convo and such with strangers, as opposed to touring with others. Look at the bright side. You won't have to put every decision before committee. Go as far or short as you want. Stop when you want. More freedom, if you are into that. This is adventure and a change of plans is just a part of it.