Earlier quoted context omitted.
No country is allowed to get more than 7% of the green cards each year (roughly speaking). This GC-H1B lock-in problem is very unique to Indians (~10 year wait), and to a lesser extent, Chinese (~4 year wait). The 7% quota would be illegal were it applied to US citizenship, according to civil rights legislations of the 1960s (prior to which non-whites were discriminated against in naturalized-citizenships via quotas)…
Although the per country limits hit India and Chinese born beneficiaries in employment based preference categories the worst, there is also a waiting list for Filipinos in employment based third and other workers. In the family based categories, Mexicans and Filipinos generally have the longest waits, with Mexican family first preference (i.e. unmarried children of US citizens) in December 1994 and Filipino fourth pr…
You can think of the same for EB3, and family petitions too. This would be more equitable than 7% quotas.
Edit: I did back of the envelope calculations based on this data: http://www.uscis.gov/tools/reports-studies/immigration-forms... For the last year, there are about 120k applications approved, while 140k is the limit. At the end of the year, the remaining 20k can be split up among people in the queue. This can be made even fairer if you aggregate it over two years, and then tie the number of immigrants to the inflation rate. I estimate it would shave off at least 3-5 years from the current wait times for EB petitions. It can even be tied to the percentage of the country's population that got an H1B. There are some more trends here: https://www.fas.org/sgp/crs/homesec/R42048.pdf