The Steam Deck has made handheld PC gaming much more affordable so it should completely dwarf the sales of all previous devices like it. Due to this and future revisions and competitors there will now be more options for handheld gaming that aren't really expensive for those who like or prefer playing games that way which makes me wonder how much the Switch's successor will be impacted by that since the Switch has benefited from a lack of direct competition in that area. For those where the appeal comes from being able to switch from handheld to dock play and vice versa some of these other options will probably try to push that aspect to further increase appeal.
This rise in handheld PC gaming has come about too late in the Switch's life cycle for the impact on it to be any more than just slight at most but the successor will have these other options impacting it from day 1 so the impact will be higher though I'm not sure by how much exactly. What do you think?