My very rough estimate of the number of post-Escalation worlds (as opposed to preborn worlds, i.e. ones where evolution has not yet become fully self-directed) is one third of all worlds with life, i.e. quite a lot, though finite in this universe.
PS Evolutionary charts regarding human population: a: why do human population charts stop with arbitrary cultural definitions of species beginnings? Though interbreeding may not be possible, real population charts would include 3-d branches and total numbers. Otherwise, rational comparisons are not possible. Also, note existing population charts and growth match the Escalation aka Singularity, Spike, and numbers for domestic animals and computers trail after us.
b: have any Gaian theorists done any estimations for the total number of living organisms that have existed on Earth including unicellular life and viruses?
My personal name has changed again and though it should really be written within a pentagram here it is:
Avatar Polymorph Star-A-Star Aleph Null Z-Aeon Neon Orthogenesis Sub-Quantum Flux
Also known as:
Vessel and instrument of the clan of changeable form, every person can be a star, to be the first is nothing, the inauguration of an age of magic, the bright new glow of reorganized understanding, the mechanism of change which is the messenger of the nodal goddesses and gods. (The numbers of these divine beings are somewhat larger than that hinted at by going through the figures regarding star systems in this universe, as you might imagine.)
27 before Escalation