Physics is an eminently theoretical field and that's why this Practical applicability has to be understood in the correct sense explained below. Additionally, note that the most relevant contribution of the Theory of relativity (i.e., its more theoretical influence, which can easily be considered as an important quasi-philosophical part of the popular culture during almost the last 100 years) will be discussed in the next section
Nowadays, the real applicability (e.g., calculations before creating a machine performing a given action) of pure Physics theories is very low. Note that highly-specialised fields of expertise (e.g., Engineering-related) are the ones in charge of coming up with the most adequate practical implementations of abstract Physics theories for each situation. On the other hand, Physics does play a very relevant theoretical role in all these other fields, whose importance cannot be dismissed.
Thus, the direct real-life applicability of the Theory of relativity (i.e., immediate application of its equations as a pre-step to build something which might have a relevant effect on our lives) can safely be considered none. On the other hand, this theory might have been used as an inspiration for real-life implementations or to perform some preliminary calculations/estimations. Other than that, the calculations from this theory have a somehow important academic relevance, focused almost exclusively on highly-specialised theoretical areas. The effects of the current project on all these situations are identical: the calculations of the Theory of relativity are wrong and, consequently, shouldn't be used.
Nevertheless, it is important to bear in mind the main reason explaining why the relativistic ideas have been considered valid (enough) for so long time: the fact of rarely being in a position to generate clearly wrong outputs. For objects moving notably slower than the speed of light (what happens most of the times), the outputs of this theory are virtually identical to the right ones (i.e., outputted by Classical Mechanics). For objects moving almost as fast as the speed of light (a quite exceptional scenario), we have the additional issue of being very difficult to exactly know what is really happening (as already explained in the corresponding section
). Hence, this peculiarity (i.e., outputs very unlikely to be noticeably wrong) will certainly be very helpful to perform any required transition without too much trouble.
In summary, the conclusions of this project are not expected to provoke many companies to spend millions just to readapt entire systems; not even whole education plans to be completely redesigned. In fact, the main impact (although hopefully not too relevant) of this project is expected to be almost exclusively focused on theoretical aspects, as discussed in the next section.