Mary, there's no 'stopping the song to scroll down' or 'squinting to read them' if you're using the software properly!

Virtually all of my songs fit on one page, and the few that don't are set up to scroll slowly automatically. Other people I know who use a tablet have a pedal which they touch with their foot to scroll/turn pages. The font-size can be set to suit whatever the user needs to be able to read it. I've never witnessed any tablet-user stop singing/playing to scroll, or squint at the screen, and I've seen plenty of tablet-users. On the other hand, I've often had to suffer people using binders flapping around with sheets of paper, dropping them on the floor, turning two pages at once and having to stop to turn back and find their place, etc. etc.

Used properly, a tablet is the least invasive form of prompt, IMHO.

And don't forget that many people have the dots on their tablets, as well as the lyrics they accompany.