The question of whether technological progress is slowing down has been around for a fair while, and is up for discussion again (hat-tip Jack Strocch(. In many sectors of the economy, notably transport, the answer is very clearly “Yes”.
On the other hand, Moore’s Law (speed doubling every 18 months) still seems to hold for computer chips and they are playing an increasingly important role in the economy. So although progress in most areas is slower than the historical average, progress in this central area is faster.
In the end, it all comes down to the long-run price elasticity of demand for computation. If this is less than one, total revenue from the sale of computational services will eventually decline relative to national income, and the ultimate situation will be one where computation is effectively free, but no longer an important source of progress. If the elasticity is greater than one, the computation-based share of GDP will rise over time, as previously separate sectors like music, video and so on are computerised.
My reading of the evidence is that the value so far is very close to one, which accounts for some of the ambiguity surrounding this question