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You might suggest to your customer, unless they are planning on programming the CPU, it should matter not what CPU is being used as they are dependent on the vendor code (in this case Cisco's IOS). They are dependent more on how well Cisco has written their code. In other words, they could obtain better performance from well written code on a CISC CPU then poorly written code on a RISC CPU. The real question is, does the 1941 offer the feature and performance they require?
On the question of "high port densities", they should clarify that. When I think of high port densities for a "router", I think, for example, of the 7600 series, as the latter supports hundreds of routed poor with wire-speed capacity. ISRs, such as the 1941, support many, many less ports, and for the ports it can support, often can not support a full complement at wire-rate. In fact, at 1941 rated at about 300 Kpps, cannot guarantee wire-rate performance for a pair of 100 Mbps Ethernet ports. (Cisco recommends 1941's for up to 25 Mbps of WAN bandwidth.)
