Wives at the bachelor party

Is it just me or does it seem a bit ridiculous that the groomsmen would suggest inviting their wives to the bachelor dinner? My fiancé and I had planned separate outings, of course, for our parties. Me and my girls are going out of town for the night for ours and the guys we're going to go deep sea fishing followed by dinner. The groomsman who is planning it called suggesting that the dinner include the wives. My fiancé is pretty laid back and said fine. He says he feels bad that the wives will be hanging out in town all day while their husbands are gone so in a way he kind of felt obligated. I think it's ridiculous and don't like the idea at all, I think he should be able to have that time with his guys. Plus I think it's kind of a crappy idea for everyone, the groomsmen are thinking about inviting other guests to attend as well, should be attending a pre-wedding party, because it certainly can't be considered a bachelor party anymore, and the bride and other half of the bridal party aren't even there. His solution, me and the girls drive an hour and a half back into town and cancel our dinner and hotel reservations to join them. I think the easiest and best solution would be for him to politely tell his groomsmen that he wants it to just be the guys! He's afraid of offending them and still concerned about what their wives will do then. It's one day! I think they'll be fine for one day without their husbands. He says he doesn't really care that much either way, but his remark that it's not much of a bachelor party any more anyways makes me think otherwise. Anyone else's thoughts? I know a lot of guys who go away for a whole weekend, why can't he have this one day??