One thing that can come out of a phase-out like this, is better lighting quality with less power usage.
Reason I say that, is when I first started my time, the T-12 Halo-phosphor tube was seriously not
performing as a lighting source and it was on the way out, here in New Zealand.
We had problems with PCB-filled ballasts and over-heating inside poorly designed fittings.
What we installed from there was the T8 single-phosphor tubes, these ran a lot cooler and had significantly greater light output for the supplied watt.
However, we were still using fitting lengths of 5 and 6' to achieve the lumens/watt.
When the T8 Tri-Phosphor tubes came out, it was like a revelation, you could now do more with shorter and more compact fittings, because you had less fittings per given lighting level.
When Thorn Lighting here bought out the 4 and 5' Slim-Paks, customers were really happy with what we had installed, unlike before.
I have to mention too that up until a few years ago, all of this new stuff used wire-wound ballasts, mainly because most of the electronic ballast gear we had here, just couldn't cut the mustard in terms of reliability, fire safety and RFI problems.
These days though, we are moving more towards the T5 nomenclature and are removing the T8 fittings, these lamps run cooler still, have extremely low levels of mercury and by design are brighter than the T8.
Even in so much that T5 is being touted as a REAL alternative to low bay sodium and Metal Halide,
and with the reflector design technology that is around these days, I reckon they'll get that.