Of course you still have naval battles in the grim, dark future. As a wise man once said "If you ever have a coastline that you'd ever like to keep, then you really need a navy".
I mean air and space power are great, don't get me wrong, but actual floating boats are CHEAP, and they can move a LOT of not only men, but also materiel, which is notoriously expensive in fuel to move by air. I mean, it's the reason the US military keeps a navy around. It may be awesomesauce to drop in 100 marines by helicopter, but when you need to move, feed, and supply 100,000 troops on the other side of an ocean, nothing beats boats.
Plus, boats are easy to reproduce when destroyed (all Washington needed was makeshift rafts to cross the delaware), whereas aircraft and definitely spacecraft are much more difficult to replace once destroyed. After a long, hard battle, an army may well not have enough air or spacecraft to be able to move troops quickly enough or keep them supplied well enough over a body of water.
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