Em...I will? Just kidding.
Basically, we will lose most of the mods we have installed right now. The most important of these mods include:
Portal Home Page
Quick Reply
Username Colors
This is only temporary though. Our host will have these mods installed, and they will also be installing even more mods.
We will have to upgrade to phpbb3 sooner or later, as our host is planning on phasing out the current version we are using completely. They have already started this process: No more mods, templates, updates, etc will be added for phpbb2. Only phpbb3 forums will be getting all the new stuff now.
Also, we will not be limited to the default skin, as I originally thought. We currently have access to several different skins.
I do not think we will lose the blog. This is unfortunate, as we really don't need it right now and I can't delete it otherwise.
We will not be able to use HTML. Well, technically, there is an exploit I can use to make HTML work (for admin use only), but there is no need for it.
phpbb3 has a thing called custom BBCode. Basically, you can take any HTML code, and convert it into BBCode tags. Makes things much simpler and safer for us.
We would lose the shoutbox for a bit once we upgraded, but I would be able to get it up and running again in no time.
In short, we're just facing a temporary slump in mods that we can use while our host upgrades the network. Everything else will be better than what we have now.
Personally, I'm all for it, as it will simplify things for us a bit.
If we do upgrade, then it will take a few days for the upgrade to take effect, giving us ample time to save anything that needs to be saved, in case it gets deleted in the upgrade. Oh, the upgrade shouldn't delete any of our posts, boards, or members. It should just render HTML useles, and (hopefully) delete the blog.
Tell you what. I'll give you guys a look of what phpbb3 looks like. Go here:
http://mythiulebeta.freeforums.org/index.php
I chose a skin that I liked to use for this example. Go ahead, register, make some posts, see how you like it.