How likely is it that you will find a job on OPT under current conditions? If you graduate from Stanford, likely. If you graduate from a small liberal arts college, exceedingly unlikely. And that’s just the first hurdle. Not everyone who found an OPT job will get an H-1B, and not everyone who gets an H-1B will eventually get a green card.
If you are Indian, your only feasible way to a green card in the next 30 years is by marrying a US citizen. That’s because of country-specific quotas, with green cards for Indians being oversubscribed and having decades-long waiting lists.
None of the bottlenecks have anything to do with Trump, by the way. The current H-1B cap was set in 2004. The country-specific quotes for green cards were set in 1965. The current administration’s only contribution so far has been to insist on more paperwork and more interviews, with the stated intent of clamping down on abuses of the H-1B program (such as employers paying below-market wages for H-1B positions, or Indian staffing firms seeking H-1B visas for positions that don’t qualify for an H-1B at all).
In short, plan on leaving the US when you are done with college. If your only reason for going to college in the US is the hope that you may be able to stay, don’t even start.