This has been chewed over for ten years I've been here and was old when I arrived, so tresimal systems have been worked out (and roundly hated, for obvious reasons) and 4, 5, and 7, 8, and, of course 10 (and 12 and 16 and 20 and 60) have been discussed, with no visible change whatsoever. And all the various other ways of combining numbers other than adding them. And a dozen (underestimate) ways of naming the numbers above two.
The separate,but obviously related, problem of reading strings of decimal digit (telephone numbers, credit card numbers, PINs, SSNs and so on throughout the bureaucracy) has also been debated and and left in the dirt many times -- and it doesn't even count as part of tp, being about unofficial words. Big numbers are the area of the most noise for the longest time with the least accomplished (Sonja added 'mute' = 20 and 'ale' = 100, which actually made matters worse) in all of tp. You can read the records in the forum (mainly jan nasa, but most other groups at some time or other) and on the old list and facebook, reddit and g+. No surprises and no results.
By the way, we threw away words (not very good ones, to be sure), for 3 and 4 ('tuli' and 'po') fairly early on (before my time, anyhow).