If it's clean inside, I would never reline it. When you park it for any extended time, keep the tank full of gas.
John
John, this may be the only time I question you.
But I think that other things should be considered before that choice is made.
If the bike is stored in a hot enviroment during the day ( over say 75F) and temp drops at night, I'd be worried about the evaporation of the gas and condensation of water (depending on humidity locally) getting into the tank, especially with an ethanol blend.
If you go this route, I'd at least recommend getting a cheap endoscope so you can check the tank (I picked up one from china that attaches to my cell phone for less than $10).
Just my thoughts, I know in my trailer where my bike is stored, evaporation is an issue (have had gas can deform over a couple months)