Most people and employers (other than the handful of places using e.g. APL) aren't willing to spend months learning a new way of doing things before they can do anything (and I dare say that's a reasonable position in most respects). So people demand - and the market provides - languages where you can at least write the basic lowest-common-denominator stuff the same way as in Algol '52. The amount of time it takes to learn to write idiomatic L2 might be the same as the amount of time it takes to learn to write idiomatic APL, but people would rather write L1-in-L2 than not be able to write anything.