Most of the extra glyphs are for non-Slavic (Turk languages of Central Asia and Siberia). You see the same (and worse) in Latin Unicode pages — just look at how many variations of vowels 'a', 'i', or 'e' you have, consonants like 'c', 'z', 's'…
US consumers are too conservative in the way they expect payments to work—checks are still in circulation and “swipe & sign” has barely been put to rest (has it?). Any system like this would require adoption by a few diverse and large-scale retail institutions to make it worthwhile for consumers to use. Or else it would be a mere alternative to “PayPal me”…