I can't tell you how many objections I heard to my planned trip. What I can tell you if you're planning something similar is that you should just ignore them! Just remember, bicycle touring is wonderful. Here's some of what I heard along with my thoughts:
It's not safeWhy is it any less safe than riding from my own house?
There are a lot of crazy (bad) people out thereThat may be true, but I really believe that most people are essentially good, and my experience on the road proved this to be true.
You're going to be lonelyActually I was never lonely on the road. I shared campsites with other bikers and hikers, and talked to a lot of different people in campgrounds, parks, and towns. And the magic of traveling alone is that you are a lot more approachable, and it seems to be much easier to meet people.
You need to take a cell phone with youThis might have been a good idea for emergencies, but I didn't have a cell phone, didn't want one, and knew that there was no coverage in a lot of the territory I'd be covering.
What if...There were a lot of what if questions. What if something breaks? What if you have an accident? What if there isn't a place to stay? I just figured I'd deal with whatever life threw at me in the best way that I could at the time. And there wasn't anything thrown at me that couldn't be handled!