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had the opportunity to discuss the similar question at different levels.
1. India , Gujarat, EMRI
Em Technicians not trained to do RSI. Dont want to do RSI.
2. India, Hyderabad, NNES 1066 ambulances
EMTs trained to do RSI. Never felt the need to do an urgent RSI, except one or two, where they did and it was very well accepted by the doctors in the hospital. But would definitely want to do RSI.
3. South Africa, EMSSA conference.
Paramedics told not to do RSI. Success rates documented on first attempt way below the accepted minimum, Paramedics themselves fought this opinion with fervour.. but alas...
4. Palo Alto, USA
Paramedics trained to do RSI, have done RSI, but no longer allowed to do it now as per company rules. More comfortable with using an LMA.

Personally
i would prefer if a paramedic i trusted completely only did an RSI. Wouldnt like an unknown paramedic to do the RSI.
Some of the ambulances where i worked were equipped with ventilators... but most are not. And even ambulances equipped with vents, get patients on bains curcuits for short distance transfers...the economics are better i guess.
But the entire problem is the training of the EMTs.
unless we train them....and in a formal way... which would need the intitiation of a formal body for training the same... we are in for... half baked knowledge.
So as long as that happens... no RSI for paramedics.