This is of course true, to the extent that it can take a long time for a path-traced image to converge to a low level of noise. But there are significant advances in using advanced filtering techniques (e.g. temporal filters) that are already very good at filtering out noise in images moving at or near interactive framerates. In combination with the kinds of effects you can capture with path tracing, definitely will provide visual benefit over rasterization.
That said, I'm not convinced that path tracing and physically-based rendering methods will ever completely replace rasterization. For some applications (especially games), the kinds of non-realistic effects you want to achieve are actually very hard to model and render using techniques that aim for realism. Probably for games we will end up with hybrid rendering that uses both at the same time.
That said, I'm not convinced that path tracing and physically-based rendering methods will ever completely replace rasterization. For some applications (especially games), the kinds of non-realistic effects you want to achieve are actually very hard to model and render using techniques that aim for realism. Probably for games we will end up with hybrid rendering that uses both at the same time.