I would keep writing and talking to my distant partners while I'm away, and hopefully some would be able to visit me, but I'm sure there's a risk that some partners end up finding other people who are more present and decide they are no longer interested in keeping a relationship with me.
This does happen. You can do a search here for "long distance relationship" and find lots of threads.
I wonder if I need less commitment than the majority of people, and I assume others will be fine, like I probably would. I perceive my future polyamorous relationships very much like I perceive friendships, and just like with friends, I can be a while without seeing them, but when I reunite it's as if I saw them yesterday and I'm very happy to see them. I feel like I'm being too naive, but it's hard to anticipate the challenges when you haven't lived the difficulties of being in polyamorous relationships.
Some people who travel a lot, say, for work, whether they are performing, lecturing, or going to conferences, etc., who are polyamorous, may end up having various lovers here and there, of various degree of seriousness. Polyamory means multiple loves, but there are degrees of love. You don't need to be totally committed for life to everyone, you know? And not all relationships last forever, anyway.
In every case, you'd need to be completely open and honest about what you can offer, emotionally and materially, how much commitment, what commitment means to you, etc. It's never ethical to lie about who you are and what you want, promising all kinds of romance and an ongoing thing, if all you really want a quick shag or two.
I'd recommend checking out our resource list here to read up on poly in general.
Polyamory in its ideal form does mean you love someone deeply and want to be with them a lot, but then some polyamorists have FWBS and fuckbuddies too. But generally there's more to it than just a quick enjoyment of someone's body for an hour or so, never to be seen again.