I don't think you've thought this through.
Certainly have not thought it through! The clue is in the name - Single Riders Queue. If all the guests in the normal queue are in groups of multiples of 2, with an efficient batcher in the station then the SRQ should hardly move on a ride with 2, 4 or 8 abreast seating.
For the SRQ to move it requires either;
* Odd-numbered groups of guests in the normal queue
* Even numbered groups, i.e. a 6 who insist on sitting 3+3
* An inefficient batcher / no batcher on the station platform - an efficient batcher should be able to get the group of 6 to sit 4+2
* Or a combination of the above
Alton Towers botched their original Rita SRQ sign by adding words to the effect of "Your wait time will be shorter in this queue" to the bottom of the sign at the SRQ entrance. Needless to say the wait time was often far from shorter & it all kicked off and they had to run several trains full of SRQ only to calm tempers down. Then, in true Towers form the black insulation tape came out and the SRQ entrance sign was amended so the shorter wait time bit was under black tape (I have got a photo of it somewhere).
The rides where SRQ really does work are where there is odd numbered seating. Test Track at Epcot is a good example as it's 3+3 seating. There is normally at least one single rider space per ride car on Test Track.