SOI: what are the roadblocks, if any, to become a mainstream technology? (technology and circuits joint rump session)

Summary form only given. A number of companies have announced that they will employ SO1 in actual LSI production. Have the issues all been settled? We would like to promote discussion among circuit designers and device/process engineers who are (or are not) interested in introducing SOI, focusing on the question ¿Will SO1 become a mainstream technology?¿ Topics we would like to discuss include: +Will SO1 analog/RF devices offer significant advantages over bulk Si technology? Can SOI-MPUs exceed bulk Si MPUs in performance or not? Can partially-depleted devices maintain advantages in very-low-power applications? and How can we downscale fully-depleted MOSFETs? +