I believe in immigration limits too. I think a case can be made for less immigration. But you can reduce immigration and still increase legal immigration. This is done by being much more aggressive with illegals.
You want to increase legal immigration above the million or so we already admit each year? Considering that this million or so already consists mostly of natural Democrats, wanting to increase that influx is like saying you want to hasten the demographic destruction of conservatism.
Unless of course you think an increase can happen that somehow changes the current natural Democrat makeup? How so? What category could be increased and not increase the number of future Democrats? H1Bs?
If there are categories you think should be increased, then why necessarily call for an increase in overall legal immigration? Why not call for an increase in a desirable category set against a decrease in others? Why not abolish the ridiculous Diversity Lottery visas Ted Kennedy came up with? Why not severely restrict refugee and asylum slots? Why not limit family migration to spouses and minor children?