If you stick to the backwaters of the west coast , a pontoon boat is ok. The aluminum will oxidize in salt water so corrosion is actually not a problem. You'll wear the boat out before it falls apart.
We used pontoon boats for years in Kaneohe Bay on Oahu to set up the daily jap dunking tours we did. The boats had cheap plywood decks, cheap polyester floor covering, and we did all sorts of mods to them and NEVER had a problem with the boats. And I had certifiable morons driving them most days.
Plus I would regularly back up the high-speed shuttle boat to the pontoon moored on the reef, tilt the engine up, and flood the occupants of the pontoon boat both mercilessly and regularly. Nothing every failed on those things, although I did manage to knock a lot of stuff off over the side.
In fact, the only problems I had with the pontoon boats in salt water were the illegal occupants passing through the US whom the owner would hire at less-than-slave wages as divemasters. I didn't want these ******* out there, and I did all I could to help them on their merry way, hence the rinseouts. Then I could have my US, mostly ex-military peeps out there with me the way God intended.
In Hawaii, I never saw a center console boat - just not the preferred style out there. They are all over Florida - in fact, there is a 30' outside my laundry room door that kinda just landed on the pad one day and stuck around.
I love the walk-around boats way more. That cabin forward can be a good thing on some days. Center consoles are cheap I guess.
I'll bet with the way the Dalai Obama has reinvigorated the economy, you can find all sorts of cheap boats over there since everyone is moving on up.