Driving a high-impedance load from a BJT base
Unless I really needed to save space, or was designing something that would get manufactured 100,000 at a time, I think I'd follow U1 with single-gate buffer, and drive the transistor (and the following logic) from that.

Your scheme would only work reliably if it picks the junction of R1 and R2 up above the positive threshold for the following logic -- which would be around 2.5V for TTL or HCT logic, but something like 3.5V for CMOS.