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Djokovic is being deported, Yayyyyy!
I think you are overestimating the magnitude of the corrections that will be needed. Thrusters are usually quite small and their typical burn times are of short duration so the fuel lasts a long time. You are correct that the L2 location is inherintly unstable but these instabilities are quite weak. No doubt if left unchecked they will lead to the satelite eventually being lost but if the position of the satelite is adjusted regularly then it takes very little energy to correct it. NASA is saying that with the fuel left after initial positioning, they should be able to keep Webb stable for at least its minimum planned life which is 10 years. I expect it will last as long as Hubble which was more like 30 years. By then they will either have sorted out something better or worked out how to maintain it and resupply it.However my (rather basic) understanding of Lagrange points suggests that whilst L4 and L5 are stable, L1,2 and 3 are not, (in the way that a ping pong ball perched upon a basketball is not stable), so it will require regular small adjustments to maintain its position.
As this will be ongoing through its expected lifespan, and it surely does not have enough propellant to facilitate this beyond initial positioning, where will the energy come from to maneuver it in years to come?
I'd have driven down there and given you $25 if I'd have known that! 😇Had an old drill press that the previous owner left in the garage, that I never used. Gave it a clean up & put it on Facebook. Had about 6 enquiries straight away, but the first guy never showed up, so contacted the next one. He jumped in his van & drove 1/2 hour here, paid my asking price & gave me a $25 voucher for his gelato shop.