I would keep it if you can afford to, quite a few folks have ditched their GEN1 and regretted it, a fair few of those have ended up buying another.
There's an Iron Butt UK article in the Feb 2018 issue of BIKE with FazerPhil who is now riding a Tiger 800 after retiring his 100,000+ mile GEN1 with "electrical issues". He says "The Fazer was a much better bike for long distance than this Triumph. It handled better and used less fuel even though it was 1000cc. I really couldn't find anything else as good as the Fazer."
There's an Iron Butt UK article in the Feb 2018 issue of BIKE with FazerPhil who is now riding a Tiger 800 after retiring his 100,000+ mile GEN1 with "electrical issues". He says "The Fazer was a much better bike for long distance than this Triumph. It handled better and used less fuel even though it was 1000cc. I really couldn't find anything else as good as the Fazer."