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No, having a professional fix the leaky pipe properly is always the most efficient and least expensive fix.
When you start having repeated problems, leaks and stoppages for example, or when those problems start to appear throughout the piping network, is the time to talk with your professional about the switch from cast iron pipes to PVC piping.
It never hurts to take a look at your existing piping. Assessing its condition on the inside of your pipes informs you in advance of coming problems. Catching problems early makes for less intense, less expensive repairs.
Trenchless pipe repair is the use of PVC liners installed inside a pipe. Those liners fill all the gaps in the existing rotten or rusted pipe, especially in old, degraded cast iron piping.