Your arguments have several counterpoints to them that you aren’t keeping in mind.
> As much as I’d love to ride around in a boat, it really wouldn’t fit in Multiplayer. While you could have water based maps for them, you’d have to remember that map movement itself would just be limited to boats.
Not necessarily. Some maps could have a few small islands connected by platforms/bridges on which infantry and small vehicles could walk. The boats could pass beside/beneath these platforms, depending on whether or not they’re suspended in the air or not.
In addition, some maps could be a mix of land and water, making both types of vehicles work together. Of course, maps would need to be designed specifically for this, but that shouldn’t be a problem.
> If the map is buildings, platforms, and boats, it only takes that one enemy team member to hit your boat with a rocket and take out your entire team.
Who says that boats would hold an entire team at once? There could be baots that hold 1, 2 or 3 people, similar to a Mongoose or Warthog. Furthermore, Covenant vehicles could over over the water, filling in the role of a boat as well.
> Also, given that most Halo games have launched with 10-to-15 maps, at least one of these maps would be designed strictly for boat combat. If boating is limited to one map, it’d get boring rather quickly. And if there were more of the 10-to-15 maps designed strictly for boating, then we’d be moving space away from actual, familiar, and universal gameplay.
Why would it be limited to a single map? Several maps could be dedicated to boat combat, with other maps having both and and boat elements. And if there are more maps that have boat elements, around 2-3, then what’s the problem with that? This is a very innovative gameplay element that would make Halo even more unique and interesting. People could have said that adding in destructible vehicles in Halo 2 moved away from the familar, universal gameplay, as with many other great additions to the series. Why not take a chance here to do something new and interesting to the franchise?
On that note, I definitely vote yes. As stated before, boats could be a great, interesting addition to the Halo franchise. If done correctly, they could bring a breath of fresh air to Halo, which hasn’t been seen in a while.
Plus, anybody remember Islandhop from Halo Custom Edition? That map had boats, and it was a ton of fun to play.