yeah, i also thought the double headers were great and very successful both in terms of protecting the health of circus but also a great experiment in showcasing the evolution of a race car not just over one GP weekend at a time but by tangibly connecting race weekends by virtue of being on a same track again the following weekend.
add in some variables like a different layout and a different set of tire compounds and we were treated to some great races last year.
for my money, i would like to see at least one back to back at the same venue become a permanent fixture on the calendar.