It's quite a large scale-up to go from the typical week or two vacation to travelling for a whole year. I wonder how many people get tired of it after a couple of months? I've met some pretty damn jaded world travellers in hostels, the kind who talk about "the same bullshit hostel conversations every day."
I felt that after 4-5 months, you get "used" to the travelling, you're not as excited anymore. The best thing to do then is either take a longer break in a nice place or simply start travelling in a different way. Another option that seems to work is to switch continents, everything is new then.