Recently my father's 93 year old uncle asked him if he could repair his old 1960s two bar electric fire as one of the elements had failed. It used to be you could buy replacement elements in whatever length you required. We looked everywhere in our part of the world (the very modern and over developed south-east of England) with no luck, all the retailers said they were no longer made and it would be easier to buy a new modern heater, something Dad didn't want to do as his uncle was familiar and comfortable usng the old fire he'd always had.
A month later we were at our cottage in Wales. Large parts of Wales are still very rural and people are not so interested in the latest gadget or technological fad, and if something still works, generally it will continue to be used. So we went into Lampeter where we knew there was a good electrical retailer. He had the elements required, but only one in the size Dad wanted and Dad wanted two. 'No problem', said the owner, 'we can order in another for Friday for you!'
So don't panic about light bulbs, it's a big world and someone somewhere will still be making the bulb you require.