Totally fine with a changing population demographics in general.
That being said, illegal immigration is a problem for various reasons that both sides can identify. Not really sure what can be done about it.... putting up a big wall isn't really that realistic. The only way to truly stem the flow is to discourage hiring on our side, and improve the economy/safety of areas that are sending the most immigrants. There's a reason we don't have a Canadian immigrant problem. As far as illegals that are here, deporting them all is unrealistic, so I think if they are otherwise law abiding, finding a clear and reasonable path to citizenship would be ideal. But those that are involved in other crimes need to be jailed, since deporting them doesn't seem to do a whole lot of good. Unless we can figure out a better way to ensure they are jailed in their home countries.
Illegal immigration is not a simple problem, unfortunately.