I actually had a look at the state of the packages a bit over a week back, and they are seriously outdated. So much that you really can't call it maintained any more. I poked some MW devs on the IRC about this, and basically no one cares enough to fix the issue, and instead just recommend to everyone not to use these packages.
In any case, it's ridiculous that you can't install openId and SMW at the same time, there is no reason why this should be the case. Bad packages are bad...
Jeroen De Dauw
Don't panic. Don't be evil.