Cisco is going down the Nortel and Siemens way. They have no interest in growing technologically.
Circuit switching yielded to packet switching for IPv4. IPv6 is by many measures a failure so what else is on the table to supplant IPv4? The demand for speeds and feeds is still growing albeit more slowly so Cisco should be able to plod along for the foreseeable future.
Even Juniper is visibly trying to expand in AI and quantum domains. At Cisco those are just stuff of ppt slides
Juniper was never more than a dwarf player in the networking market after more than 27 years since its founding. A sudden tenfold growth in revenue would still leave them behind Cisco, so good luck.
If you've read those PowerPoint slides and noticed a few sensible points amid much nonsense and put the sensible points into Google you'll see that no idea was created by anyone at Cisco. The reason most of Cisco's business is built on acquisitions is because they don't have any development skills and haven't for decades. To see how an acquisition would affect Cisco note that for each billion in addition revenue Cisco grows by less than 2%, so good luck.