“ It makes a big difference to the Spanish who work in Gibraltar and Gilbraltarians with homes in Spain. In time, it could lead to greater integration between Gibraltar and Spain and then, who knows ...”
As you say who knows.
Currently Gibraltar is a Tax Haven with different customs rules so just like Jersey immigration rules apply and you have to show identity documents. How that would make it more likely to become part of Spain is pretty hard to understand.
People eating and drinking on the go
Should women have equal pay and opportunities?