Actually attempting to abolish birthright citizenship is too late now. They should have done before 2000 as the demography was supporting for that. Now it is very difficult as it is too political in nature and difficult even to get a simple majority in senate. India population after independence was 330 million and that was considered as huge and they encouraged family control. In 2010 US has more than 300 million(though the land is 3 times India still livable land may be 2 times than India) and still it cannot have unlimited immigration. At some point of time they may realize and control everything but that will be too late. Overall direct immigration numbers I am not anticipating any increase or decrease in annual numbers for next 10 years( I am sure EB3-I and EB2-I waiters will not happy) but there will be attempts to increase but talks of reducing immigration will make the immigrants happy with status quo.