CEDAR RAPIDS — Rick Paulos, a Cedar Rapids man who has ridden every RAGBRAI since its spontaneous inception in 1973, said despite the surprise resignation this week of its four-person marketing staff and plans for a rival ride, the annual statewide bike ride and tourism juggernaut has survived other threats, and will again.Others have organized large-scale bike rides — albeit not competing head-to-head with the Des Moines Register’s Annual Great Bicycle Ride Across Iowa — and they’ve fizzled after limited success, And RAGBRAI has forged ahead after losing other figureheads over the years.“RAGBRAI has never been about the organizers,” said Paulos, 63.