I suggest you buy an external incident/reflected lightmeter and learn to use it. Slides are not difficult to use, with good metering technique you'lll be fine in most situations, and you will recognize instantly those circumstances where the subject brightness range exceeds what a slide film can take with pleasant results. An external light meter goes a long way in assuring a correct exposure in difficult situations IMO. When photographing children you want to be concentrated on the moment, and not on exposure.
Automatic exposure, with all the backlight - bright background situations to be concerned of, is IMO less reliable and simple than analysing the light with an external light meter and working in manual mode.
I wouldn't be pessimistic about slide film being the next casualty. Ferrania is going to come back in a few quarters, and their first product will be slide film in various formats. They will also provide chemicals as far as I understand. I wouldn't be surprised if they were thinking about some kind of rotary processor as well, they stated they consider home-processing key for the well-being of the market.
Super-8 cine film in transparency also seems to be in their plans.
Certainly slide film is the weakest, more fragile part of the film market, but is far from being dead.
Considering your long-term project I warmly advice you to buy a rotary processor or to try in any case to develop slides at home. That will result in much satisfaction and great savings.
I also suggest to buy one of those electronic devices able to extract a numeric-format image from a slide. It's children pictures, you certainly want to circulate some of them in the family using the usual numeric formats. Don't be deterred by the price, for a long-term project you will not regret the expense. Try to go for real quality. (If you want to dig into this matter more, please open a thread on DPUG.org and come back here to warn us so that we can answer to you there).