I'm taking out all my in ground trees, they are to hard to protect over 7ft tall. I think only way to manage will be containers bagging everything. BSF has really made it a pain to grow fig trees.
I stopped collecting any more fig varieties. I have tried fly traps, bagging, etc. Bagging seems not fool proof either, the timing of placing the bags and getting to the fig before the scourge does.
The timing of placing the bags is... as soon as the figlet can hold the bag. I know is frustrating. FWIW, here in my tree I don't bag all my cvs, it's a 25 year old, cocktail tree with over 50 varieties and the original one is not protected and still give me a lot of fruit despise BFF, birds and Mediterranean fruit fly. (On a side note, I also discovered this year that a couple of varieties are actually Smyrna because I put the bags ASAP and the figs all fell down in the last weeks). So, for a very big, productive common tree, BFF here in Spain can reduce the crop (for figs, for brevas is dramatic enough to bag always if you want to harvest more than a dozen). But for domestic consumption, it can be still worth keeping the tree even without placing bags in every fig. I would check each case in big trees for a couple of years at least before removing the big ones because the orientation of the tree and even the cv can determine how much of the crop is lost (also the weather of each particular year).
BFF is one of those cases when a species that has been always here without giving too many problems suddenly started to be a serious plague for commercial crops in all the Mediterranean basin. For common cvs, I know that deltamethrin is working fine in reducing the population, but Smyrna crops in the north of Tunisia for example are struggling to produce enough caprifigs. In many areas commercial Smyrna figs are done, I think, at least that they come up with a solution to drastically reduce the populations of the fly without affecting the wasp, but moving to common varieties seems just easier. What made this fly so successful in causing these damages only in recent times is still a mystery as far as I know, maybe global warming, maybe it evolved to reproduce faster, or maybe its natural predators were too affected by the wide use of pesticides. In any case, my advice is to don't give up on big, old trees until you have observed the behavior of the fly for 2-3 years (potential predators also need time to adjust to the new prey), and bag as soon as possible for small ones.
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I'll try to convince my brain that is floral during next season 
