I won't vote because the choice is to tied in to your personal preference.

I will say that I'd replace it but if I did L'd be going the opposite direction. The bikes you propose for replacing it tend to be more truck like than your current bike. If I were replacing it I'd be going to something more sporty. Since you want fatter tires it seems likely that you want to go in the opposite direction that I would go.

For me, going lighter on a sportier bike is just a lot more fun. Going, with something like and LHT and a heavy enough load that the LHT makes sense would suck a lot of the joy out of touring. Again that is just my personal preference.

I'd say go with what makes you happiest. Oh and I doubt you will get much for the old bike so I'd say keep it even if you get another, if you like it and have room for it.